3. Open Powershell Command, run this command to get your application ID:

Get-appxpackage | select-string WPFUWP

For example, I go the result: WPFUWP_1.0.0.1_x86__s46g25shpckvj for my App WPFUWP.

4. Based on your app bit, open Command Window, use 32bit (x86) folder or 64bit (x64) folder of Windows Debugger, run this command (my wpfuwp is 32bit app, so I choose Debuggers\X86) to enable debugging tool for my App: